Top common phone line faults affecting landline adsl

Adding a telephone extension wiring to your master socket

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Wiring information

Telephone wiring colour code bt extension

Modern openreach vdsl adsl faceplate help page

The diagram shows a simple circuit with two switches connected in series to control a lamp.

Switch S1 OR Switch S2 (or both of them) must be closed to light the lamp.

I recommend Electronics for Kids as a good introduction to electricity and electronics. Printed in full colour with many illustrations, it introduces common components with simple but interesting projects to build at each stage. The book starts by assuming no previous knowledge then carefully builds up straightforward explanations of how components work, plus practical techniques including wire-stripping, soldering and using a multimeter.

We can see, hear or feel the effects of electricity flowing such as a lamp lighting, a bell ringing, or a motor turning - but we cannot see the electricity itself, so which way is it flowing?